While booting 6.1.0-rc4-next-20221109 next kernel on a IBM Power9 LPAR
following warning is seen:
[ 8.808868] [ cut here ]
[ 8.808872] WARNING: CPU: 1 PID: 378 at kernel/module/main.c:852
module_put+0x48/0x100
[ 8.808881] Modules linked in: sr_mod(E) cdrom(E) sd_mod(E) sg(
Le 10/11/2022 à 01:39, Jordan Niethe a écrit :
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
>> This uses more optimal ll/sc style access patterns (rather than
>> cmpxchg), and also sets the EH=1 lock hint on those operations
>> which acquire ownership
On Thu Nov 10, 2022 at 10:35 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
>
> > -#define queued_spin_lock queued_spin_lock
> >
> > -static inline void queued_spin_unlock(struct qspinlock *lock)
> > +static __always_inline int queued_spin_trylock(struc
On Thu Nov 10, 2022 at 10:36 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
>
> [resend as utf-8, not utf-7]
> >
> > +/*
> > + * Bitfields in the atomic value:
> > + *
> > + * 0: locked bit
> > + * 16-31: tail cpu (+1)
> > + */
> > +#define_Q_SE
On Thu Nov 10, 2022 at 10:39 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > The first 16 bits of the lock are only modified by the owner, and other
> > modifications always use atomic operations on the entire 32 bits, so
On Thu Nov 10, 2022 at 10:39 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > This uses more optimal ll/sc style access patterns (rather than
> > cmpxchg), and also sets the EH=1 lock hint on those operations
> > which acqu
On Wed, Nov 09, 2022 at 03:10:37PM -0500, Nayna wrote:
>
> On 11/9/22 08:46, Greg Kroah-Hartman wrote:
> > On Sun, Nov 06, 2022 at 04:07:42PM -0500, Nayna Jain wrote:
> > > securityfs is meant for Linux security subsystems to expose policies/logs
> > > or any other information. However, there are
On Thu Nov 10, 2022 at 10:40 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Allow new waiters a number of spins on the lock word before queueing,
> > which particularly helps paravirt performance when physical CPUs are
>
On Thu Nov 10, 2022 at 10:40 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Give the queue head the ability to stop stealers. After a number of
> > spins without sucessfully acquiring the lock, the queue head employs
> >
On Thu Nov 10, 2022 at 10:40 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Store the owner CPU number in the lock word so it may be yielded to,
> > as powerpc's paravirtualised simple spinlocks do.
> > ---
> > arch/powe
On Thu Nov 10, 2022 at 10:41 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Waiters spinning on the lock word should yield to the lock owner if the
> > vCPU is preempted. This improves performance when the hypervisor ha
On Thu Nov 10, 2022 at 10:41 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Queued waiters which are not at the head of the queue don't spin on
> > the lock word but their qnode lock word, waiting for the previous queued
On Thu Nov 10, 2022 at 10:42 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > If the head of queue is preventing stealing but it finds the owner vCPU
> > is preempted, it will yield its cycles to the owner which could cause
On Thu Nov 10, 2022 at 10:42 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Having all CPUs poll the lock word for the owner CPU that should be
> > yielded to defeats most of the purpose of using MCS queueing for
> > scal
On Thu Nov 10, 2022 at 10:42 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > After the head of the queue acquires the lock, it releases the
> > next waiter in the queue to become the new head. Add an option
> > to prod the
On Thu Nov 10, 2022 at 10:43 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > This gives trylock slightly more strength, and it also gives most
> > of the benefit of passing 'val' back through the slowpath without
> > the c
On Thu Nov 10, 2022 at 10:43 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Use the spin_begin/spin_cpu_relax/spin_end APIs in qspinlock, which helps
> > to prevent threads issuing a lot of expensive priority nops which m
On Thu Nov 10, 2022 at 10:43 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Allow for a reduction in the number of times a CPU from a different
> > node than the owner can attempt to steal the lock before queueing.
> > Th
On Thu Nov 10, 2022 at 10:44 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Provide an option that holds off queueing indefinitely while the lock
> > owner is preempted. This could reduce queueing latencies for very
> > o
On Thu Nov 10, 2022 at 10:44 AM AEST, Jordan Niethe wrote:
> On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> [resend as utf-8, not utf-7]
> > Finding the owner or a queued waiter on a lock with a preempted vcpu
> > is indicative of an oversubscribed guest causing the lock to get into
>
On Thu Nov 10, 2022 at 4:37 PM AEST, Christophe Leroy wrote:
>
>
> Le 10/11/2022 à 01:35, Jordan Niethe a écrit :
> > On Thu, 2022-07-28 at 16:31 +1000, Nicholas Piggin wrote:
> >
> >> -#define queued_spin_lock queued_spin_lock
> >>
> >> -static inline void queued_spin_unlock(struct qspinlock *
On Thu Nov 10, 2022 at 6:36 PM AEST, Christophe Leroy wrote:
>
>
> Le 10/11/2022 à 01:39, Jordan Niethe a écrit :
> >> +static __always_inline int trylock_clear_tail_cpu(struct qspinlock *lock,
> >> u32 old)
> >> {
> >> - int newval = _Q_LOCKED_VAL;
> >> -
> >> - if (atomic_cmpxchg_acquire(&lo
Le 10/11/2022 à 13:34, yang.yan...@zte.com.cn a écrit :
> [Vous ne recevez pas souvent de courriers de yang.yan...@zte.com.cn.
> Découvrez pourquoi ceci est important à
> https://aka.ms/LearnAboutSenderIdentification ]
>
> From: Xu Panda
>
> Replace the open-code with sysfs_emit() to simplify
Hi Greg,
Le 06/10/2022 à 07:27, Christophe Leroy a écrit :
> NO_IRQ is used to check the return of irq_of_parse_and_map().
>
> On some architecture NO_IRQ is 0, on other architectures it is -1.
>
> irq_of_parse_and_map() returns 0 on error, independent of NO_IRQ.
>
> So use 0 instead of using N
On Thu, Nov 10, 2022 at 01:25:14PM +, Christophe Leroy wrote:
> Hi Greg,
>
> Le 06/10/2022 à 07:27, Christophe Leroy a écrit :
> > NO_IRQ is used to check the return of irq_of_parse_and_map().
> >
> > On some architecture NO_IRQ is 0, on other architectures it is -1.
> >
> > irq_of_parse_and
On Mon 2022-11-07 15:22:24, John Ogness wrote:
> It is not reliable to check for CON_ENABLED in order to identify if a
> console is registered. Use console_is_registered() instead.
>
> Signed-off-by: John Ogness
Reviewed-by: Petr Mladek
Best Regards,
Petr
On 11/9/22 17:41, Vladimir Oltean wrote:
> On Thu, Nov 03, 2022 at 05:06:39PM -0400, Sean Anderson wrote:
>> Several (later) patches in this series cannot be applied until a stable
>> release has occured containing the dts updates.
>
> New kernels must remain compatible with old device trees.
Wel
On 11/9/22 17:59, Vladimir Oltean wrote:
> On Thu, Nov 03, 2022 at 05:06:39PM -0400, Sean Anderson wrote:
>> For a long time, PCSs have been tightly coupled with their MACs. For
>> this reason, the MAC creates the "phy" or mdio device, and then passes
>> it to the PCS to initialize. This has a few
On Thu, Nov 10, 2022 at 09:55:32AM -0500, Sean Anderson wrote:
> On 11/9/22 17:41, Vladimir Oltean wrote:
> > On Thu, Nov 03, 2022 at 05:06:39PM -0400, Sean Anderson wrote:
> >> Several (later) patches in this series cannot be applied until a stable
> >> release has occured containing the dts updat
On 11/10/22 10:29, Vladimir Oltean wrote:
> On Thu, Nov 10, 2022 at 09:55:32AM -0500, Sean Anderson wrote:
>> On 11/9/22 17:41, Vladimir Oltean wrote:
>> > On Thu, Nov 03, 2022 at 05:06:39PM -0400, Sean Anderson wrote:
>> >> Several (later) patches in this series cannot be applied until a stable
>>
On Thu, Nov 10, 2022 at 10:39:30AM -0500, Sean Anderson wrote:
> On 11/10/22 10:29, Vladimir Oltean wrote:
> > On Thu, Nov 10, 2022 at 09:55:32AM -0500, Sean Anderson wrote:
> >> On 11/9/22 17:41, Vladimir Oltean wrote:
> >> > On Thu, Nov 03, 2022 at 05:06:39PM -0400, Sean Anderson wrote:
> >> >> S
On Thu, Nov 10, 2022 at 05:01:34PM +0100, Andrew Lunn wrote:
> On Thu, Nov 10, 2022 at 03:29:26PM +, Vladimir Oltean wrote:
> > On Thu, Nov 10, 2022 at 09:55:32AM -0500, Sean Anderson wrote:
> > > On 11/9/22 17:41, Vladimir Oltean wrote:
> > > > On Thu, Nov 03, 2022 at 05:06:39PM -0400, Sean An
On Thu, Nov 10, 2022 at 03:29:26PM +, Vladimir Oltean wrote:
> On Thu, Nov 10, 2022 at 09:55:32AM -0500, Sean Anderson wrote:
> > On 11/9/22 17:41, Vladimir Oltean wrote:
> > > On Thu, Nov 03, 2022 at 05:06:39PM -0400, Sean Anderson wrote:
> > >> Several (later) patches in this series cannot be
On Thu, Nov 10, 2022, Robert Hoo wrote:
> > -static int kvm_starting_cpu(unsigned int cpu)
> > +static int kvm_online_cpu(unsigned int cpu)
> > {
> > + int ret = 0;
> > +
> > raw_spin_lock(&kvm_count_lock);
> > - if (kvm_usage_count)
> > + /*
> > +* Abort the CPU online process if ha
On Thu, Nov 10, 2022, Robert Hoo wrote:
> After this patch set, still find some printk()s left in arch/x86/kvm/*,
> consider clean all of them up?
Hmm, yeah, I suppose at this point it makes sense to tack on a patch to clean
them up.
On 11/10/22 11:00, Vladimir Oltean wrote:
> On Thu, Nov 10, 2022 at 10:39:30AM -0500, Sean Anderson wrote:
>> On 11/10/22 10:29, Vladimir Oltean wrote:
>> > On Thu, Nov 10, 2022 at 09:55:32AM -0500, Sean Anderson wrote:
>> >> On 11/9/22 17:41, Vladimir Oltean wrote:
>> >> > On Thu, Nov 03, 2022 at
On Thu, Nov 10, 2022, Huang, Kai wrote:
> On Thu, 2022-11-10 at 01:33 +, Huang, Kai wrote:
> > > @@ -9283,7 +9283,13 @@ static int
> > > kvm_x86_check_processor_compatibility(struct kvm_x86_init_ops *ops)
> > > int cpu = smp_processor_id();
> > > struct cpuinfo_x86 *c = &cpu_data(cpu);
> >
On 11/10/22 00:01, Sachin Sant wrote:
While booting 6.1.0-rc4-next-20221109 next kernel on a IBM Power9 LPAR
following warning is seen:
[ 8.808868] [ cut here ]
[ 8.808872] WARNING: CPU: 1 PID: 378 at kernel/module/main.c:852
module_put+0x48/0x100
[ 8.809024] sd 1:0:0:1:
At boot time, the FDT is parsed to compute the number of CPUs.
In addition count the number of CPU nodes and export it.
This is useful when building the FDT for a kexeced kernel since we need to
take in account the CPU node added since the boot time during CPU hotplug
operations.
Signed-off-by: L
On a system with a large number of CPUs, the creation of the FDT for a
kexec kernel may fail because the allocated FDT is not large enough.
When this happens, such a message is displayed on the console:
Unable to add ibm,processor-vadd-size property: FDT_ERR_NOSPACE
The property's name may chang
When adding CPUs to an already big system (test show it seems to start with
more than 256 CPUs), the kernel is showing error messages when building the
FDT for the kexec kernel (kdump or kexec).
It's worth to mention that the kdump kernel is reloaded after a CPU add
operation.
The messages look l
Most BPF programs are small, but they consume a page each. For systems
with busy traffic and many BPF programs, this may also add significant
pressure on instruction TLB. High iTLB pressure usually slows down the
whole system causing visible performance degradation for production
workloads.
bpf_pr
Implement bpf_arch_text_invalidate and use it to fill unused part of
the bpf_prog_pack with trap instructions when a BPF program is freed.
Signed-off-by: Hari Bathini
---
arch/powerpc/net/bpf_jit_comp.c | 32
1 file changed, 32 insertions(+)
diff --git a/arch/po
bpf_arch_text_copy is used to dump JITed binary to RX page, allowing
multiple BPF programs to share the same page. Using patch_instruction
to implement it.
Signed-off-by: Hari Bathini
---
arch/powerpc/net/bpf_jit_comp.c | 39 -
1 file changed, 38 insertions(+), 1
Use bpf_jit_binary_pack_alloc in powerpc jit. The jit engine first
writes the program to the rw buffer. When the jit is done, the program
is copied to the final location with bpf_jit_binary_pack_finalize.
With multiple jit_subprogs, bpf_jit_free is called on some subprograms
that haven't got bpf_ji
On Mon, Oct 31, 2022 at 10:39:49AM -0500, Bjorn Helgaas wrote:
> From: Bjorn Helgaas
>
> Many host controller drivers #include even though they
> don't need it. Remove the unnecessary #includes.
>
> v2: https://lore.kernel.org/r/20221025185147.665365-1-helg...@kernel.org/
> v1: https://lore.ke
On Fri, Nov 04, 2022, Isaku Yamahata wrote:
> On Thu, Nov 03, 2022 at 10:34:10PM +,
> Sean Christopherson wrote:
>
> > On Thu, Nov 03, 2022, Isaku Yamahata wrote:
> > > On Wed, Nov 02, 2022 at 11:19:03PM +,
> > > Sean Christopherson wrote:
> > > > diff --git a/arch/x86/include/asm/kvm_ho
From: Xu Panda
Replace the open-code with sysfs_emit() to simplify the code.
Reported-by: Zeal Robot
Signed-off-by: Xu Panda
Signed-off-by: Yang Yang
---
drivers/scsi/ibmvscsi/ibmvfc.c | 16
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/scsi/ibmvscsi/
On Thu, Nov 03, 2022, Vitaly Kuznetsov wrote:
> Sean Christopherson writes:
> > + /*
> > +* Reset everything to support using non-enlightened VMCS access later
> > +* (e.g. when we reload the module with enlightened_vmcs=0)
> > +*/
> > + for_each_online_cpu(cpu) {
> > + v
Hi Michael,
Could the PowerPC tree take this patch set which resolves a
PowerVM/KVM-specific issue?
On Thu, Sep 01, 2022 at 05:46:06PM -0400, Stefan Berger wrote:
The of-tree subsystem does not currently preserve the IBM vTPM 1.2 and
vTPM 2.0 measurement logs across a kexec on PowerVM and Power
From: Michael Ellerman
[ Upstream commit 2153fc9623e5465f503d793d4c94ad65e9ec9b5f ]
There's a build failure for Book3E without AltiVec:
Error: cc1: error: AltiVec not supported in this target
make[6]: *** [/linux/scripts/Makefile.build:250:
drivers/gpu/drm/amd/amdgpu/../display/dc/dml/disp
Hello.
My platform is a 7447A with Marvell GT64260 bridge chip. I have currently
got the kernel upgraded to v3.12 (started from v2.6.26) and only have one
more piece to get working that has never worked. There is a CPLD on the
board. It maps in just fine and I can read the registers without issue
On Tue, 18 Oct 2022 00:40:14 PDT (-0700), wangkefeng.w...@huawei.com wrote:
Most architectures(except arm64/x86/sparc) simply return 1 for
kern_addr_valid(), which is only used in read_kcore(), and it
calls copy_from_kernel_nofault() which could check whether the
address is a valid kernel address
On Thu, Nov 03, 2022 at 03:25:04PM +0100, Andrew Jones wrote:
> The valid cpumask range is [0, nr_cpu_ids) and cpumask_next()
> currently calls find_next_bit() with its input CPU ID number plus one
> for the bit number, giving cpumask_next() the range [-1, nr_cpu_ids - 1).
> seq_read_iter() and cpu
>> [ 8.809079] [c7c37e10] [c000cffc]
>> ret_from_kernel_thread+0x5c/0x64
>> [ 8.809086] Instruction dump:
>> [ 8.809090] f821ffc1 41820034 395e03c0 7c0004ac 7d205028 2c090001 3929
>> 41c00010
>> [ 8.809101] 7d20512d
>> [ 8.809101] sd 1:0:0:1: [sdc] Preferred minimum I/O size 3
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